Liebert NX UPS System user manual Inverter output to critical load

Technical Specifications

Table 34 Battery

Intermediate DC Circuit

Rated Power,

Unit of

kVA

Measurement

10

15

20

30

Battery Bus

VDC

Nominal: 480V (VRLA Float charge is 540V)

Voltage

Range: 400V - 616V

Number of Lead-

Acid Cells

Nominal

240 = [40 x 6-cell (12V) blocks]

Maximum

264 = [44 x 6-cell (12V) blocks]

Float Voltage

V/cell (VRLA)

2.25 V/cell (selectable from 2.2 –2.3V/cell)

Constant current and constant voltage (IU) charge mode

Temperature

mV/°C/cl

- 3.0 (selectable 0 to – 5.0 around 25°C or 30°C. or inhibit)

Compensation

Ripple Voltage

% V float

≤1

Ripple Current

% C10

≤5

Boost Voltage

V/cell (VRLA)

2.35 V/cell (selectable from 2.30-2.40V/cell)

Constant current and constant voltage (IU) charge mode

- float-boost current trigger 0.050 C10 (selectable 0.030-0.070)

Boost Control

- boost-float current trigger 0.010 C10

(selectable 0.005-0.025) with

24 hr safety timeout (selectable 8-30 hr)

- boost mode inhibit also selectable

End Of

1.63 V/cell (selectable from 1.60~1.75 V/cell

V/cell (VRLA)

Auto Inverse EOD voltage x discharge current mode

Discharge

(The end of discharge voltage increases at low discharge currents).

2.4 V/cell (selectable from 2.3-2.4V/cell)

Battery Charge

V/cell

Constant current and constant voltage (IU) charge mode

Programmable auto trigger or inhibit of boost mode

Battery

kW

2.5

5

5

7.5

Charging Power*

max current

A

3.75

7.5

7.5

12

(adjustable) 1

* At low input voltage

the UPS recharge capability increases with load decrease (up to the maximum capacity indicated)

1. Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells.

Table 35 Inverter output to critical load

Unit of

Rated Power, kVA (kW)

Measurement

10 (8)

15 (12)

20 (16)

30 (24)

Rated AC Voltage 1

VAC

380/400/

415 V (three-phase, four-wire with neutral

referenced to the bypass neutral)

Frequency 2

Hz

50 / 60

110% for 60 min

Overload

% Rated

125% for 10 min

150% for 1 min

>150% for 200 msec

Fault Current

% Rated

340% current limitation for 200 msec

Non linear load capability 3

% Rated

100%

Neutral current capability

% Rated

170%

Steady state voltage stability

%

±1 (balanced load), ±2 (100% unbalanced load),

Transient voltage response 4

%

± 5

Total Harmonic Voltage

%

< 1 (linear load), < 4 (non linear load 3)

Distortion (THDV)

Synchronisation - Window

Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)

Slew Rate (Max change rate

1 Hz/sec

Hz sec

selectable 0.1 to 3Hz/s (single UPS)

of synch frequency)

0.2Hz/sec (paralleled UPS)

Inverter Voltage Tolerance

%V (AC)

±5

1.Factory set to 400V – 380 or 415V selectable by commissioning engineer.

2.Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.

3.EN 50091-3 (1.4.58) crest factor 3:1

4.IEC 62040-3 / EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state output voltage within half a cycle.

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